What enemies did the Blackfoot Indians have?

If you mean enemies, the Blackfoot tribes (Blood, Blackfoot, Piegan and their allies the Atsina and Sarcee) fought almost continual war against the Crows, the Shoshone, the Cree, the Flatheads (Interior Salish) the Kutenai, the Assiniboin, the Pend d'Oreilles and against white explorers, trappers, mountain men and traders.